1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sam9x5_wm8731   --	SoC audio for AT91SAM9X5-based boards
4 *			that are using WM8731 as codec.
5 *
6 *  Copyright (C) 2011 Atmel,
7 *		  Nicolas Ferre <nicolas.ferre@atmel.com>
8 *
9 *  Copyright (C) 2013 Paratronic,
10 *		  Richard Genoud <richard.genoud@gmail.com>
11 *
12 * Based on sam9g20_wm8731.c by:
13 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
14 */
15#include <linux/of.h>
16#include <linux/export.h>
17#include <linux/module.h>
18#include <linux/mod_devicetable.h>
19#include <linux/platform_device.h>
20#include <linux/device.h>
21
22#include <sound/soc.h>
23#include <sound/soc-dai.h>
24#include <sound/soc-dapm.h>
25
26#include "../codecs/wm8731.h"
27#include "atmel_ssc_dai.h"
28
29
30#define MCLK_RATE 12288000
31
32#define DRV_NAME "sam9x5-snd-wm8731"
33
34struct sam9x5_drvdata {
35	int ssc_id;
36};
37
38/*
39 * Logic for a wm8731 as connected on a at91sam9x5ek based board.
40 */
41static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
42{
43	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
44	struct device *dev = rtd->dev;
45	int ret;
46
47	dev_dbg(dev, "%s called\n", __func__);
48
49	/* set the codec system clock for DAC and ADC */
50	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
51				     MCLK_RATE, SND_SOC_CLOCK_IN);
52	if (ret < 0) {
53		dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
54		return ret;
55	}
56
57	return 0;
58}
59
60/*
61 * Audio paths on at91sam9x5ek board:
62 *
63 *  |A| ------------> |      | ---R----> Headphone Jack
64 *  |T| <----\        |  WM  | ---L--/
65 *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
66 *  |1| <------------ |      | <--L--/
67 */
68static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
69	SND_SOC_DAPM_HP("Headphone Jack", NULL),
70	SND_SOC_DAPM_LINE("Line In Jack", NULL),
71};
72
73static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
74{
75	struct device_node *np = pdev->dev.of_node;
76	struct device_node *codec_np, *cpu_np;
77	struct snd_soc_card *card;
78	struct snd_soc_dai_link *dai;
79	struct sam9x5_drvdata *priv;
80	struct snd_soc_dai_link_component *comp;
81	int ret;
82
83	if (!np) {
84		dev_err(&pdev->dev, "No device node supplied\n");
85		return -EINVAL;
86	}
87
88	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
89	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
90	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
91	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
92	if (!dai || !card || !priv || !comp) {
93		ret = -ENOMEM;
94		goto out;
95	}
96
97	snd_soc_card_set_drvdata(card, priv);
98
99	card->dev = &pdev->dev;
100	card->owner = THIS_MODULE;
101	card->dai_link = dai;
102	card->num_links = 1;
103	card->dapm_widgets = sam9x5_dapm_widgets;
104	card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
105
106	dai->cpus = &comp[0];
107	dai->num_cpus = 1;
108	dai->codecs = &comp[1];
109	dai->num_codecs = 1;
110	dai->platforms = &comp[2];
111	dai->num_platforms = 1;
112
113	dai->name = "WM8731";
114	dai->stream_name = "WM8731 PCM";
115	dai->codecs->dai_name = "wm8731-hifi";
116	dai->init = sam9x5_wm8731_init;
117	dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
118		| SND_SOC_DAIFMT_CBP_CFP;
119
120	ret = snd_soc_of_parse_card_name(card, "atmel,model");
121	if (ret) {
122		dev_err(&pdev->dev, "atmel,model node missing\n");
123		goto out;
124	}
125
126	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
127	if (ret) {
128		dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
129		goto out;
130	}
131
132	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
133	if (!codec_np) {
134		dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
135		ret = -EINVAL;
136		goto out;
137	}
138
139	dai->codecs->of_node = codec_np;
140
141	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
142	if (!cpu_np) {
143		dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
144		ret = -EINVAL;
145		goto out_put_codec_np;
146	}
147	dai->cpus->of_node = cpu_np;
148	dai->platforms->of_node = cpu_np;
149
150	priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
151
152	ret = atmel_ssc_set_audio(priv->ssc_id);
153	if (ret != 0) {
154		dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
155			ret, priv->ssc_id);
156		goto out_put_cpu_np;
157	}
158
159	ret = devm_snd_soc_register_card(&pdev->dev, card);
160	if (ret) {
161		dev_err(&pdev->dev, "Platform device allocation failed\n");
162		goto out_put_audio;
163	}
164
165	dev_dbg(&pdev->dev, "%s ok\n", __func__);
166
167	goto out_put_cpu_np;
168
169out_put_audio:
170	atmel_ssc_put_audio(priv->ssc_id);
171out_put_cpu_np:
172	of_node_put(cpu_np);
173out_put_codec_np:
174	of_node_put(codec_np);
175out:
176	return ret;
177}
178
179static void sam9x5_wm8731_driver_remove(struct platform_device *pdev)
180{
181	struct snd_soc_card *card = platform_get_drvdata(pdev);
182	struct sam9x5_drvdata *priv = card->drvdata;
183
184	atmel_ssc_put_audio(priv->ssc_id);
185}
186
187static const struct of_device_id sam9x5_wm8731_of_match[] = {
188	{ .compatible = "atmel,sam9x5-wm8731-audio", },
189	{},
190};
191MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
192
193static struct platform_driver sam9x5_wm8731_driver = {
194	.driver = {
195		.name = DRV_NAME,
196		.of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
197	},
198	.probe = sam9x5_wm8731_driver_probe,
199	.remove_new = sam9x5_wm8731_driver_remove,
200};
201module_platform_driver(sam9x5_wm8731_driver);
202
203/* Module information */
204MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
205MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
206MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
207MODULE_LICENSE("GPL");
208MODULE_ALIAS("platform:" DRV_NAME);
209